Electric bell with momentum action gong striker



M. COLEMAN Sept. 19, 1950 ELECTRIC BELL WITH MOMENTUM ACTION GONG STRIKER Filed Aug. 26, 1949 INVENTOR.

Patented Sept. 19, 19 50 ELECTRIC BELL WITH MOMENTUM ACTION GONG STRIKER Maurice Coleman, Brooklyn, N. Y.

Application August 26, 1949, Serial No. 112,569

3 Claims.

,The present invention relates to electric bells and in particular to the type where the gong shields the operating mechanism which includes a slidably mounted hammer or striker adapted to hit the interior surface of the gong near rim region;

I Heretofore, in bells of the character and construction mentioned, the scope of movement of the striker towards the gong, was directly determined by the movement of the armature which is actuated by the electro-magnet. In fact, the armature actually brought the striker all the way fromrest position, into contact with the gong. Unless the extent of movement of the armature movement was properly adjusted and then remained constant, the striker would either tap the gong slightly, or else the striker would upon contact with the gong, press thereon and destroy the gongs vibration. The former condition would yield a ring of little audibility, while the latter, would give a "dead sound.

7 It is therefore an object of this invention to provide an electric bell of the class described, of novel and improved construction, which will avoid the objectionable incidents mentioned, and which will operate to give clear and alive gong ring.

Another object hereof is to provide an electric bell of the kind set forth, of novel and improved construction, having a new mode of operation which may be particularly stated that instead of having the armature carry the striker to the gong for contact, this invention teaches a construction where the armature hits the striker, thereby throwing it towards the gong. Further, means are provided to prevent the striker from deadening the gongs vibration, after the bell is struck, so that the result is a good, loud, clear and alive" ring, adaptable to bells of the single stroke .or continuously ringing type.

In bell wiring systems using ground connection in the circuit, and in bells operating in circuits where one of the power source terminals is grounded, it is essential in continuously ringing, or; as commonly called vibrating type of bells, that the circuit breaker components be insulated from frame. It has been usual to have one of the circuit breaker contacts, carried by the armature directly. Hence either said contact or else the armature had to be insulated from the bell frame.

Y Another object of this invention is to provide a novel and improved vibrating electric bell whose armature carries none of the breaker contacts, but iscalled upon to operate the circuit breaker by use of novel and improved tion operating in a novel manner.

A further object of this invention is to provide the said novel and improved electric bell, which is reasonably cheap to manufacture, simple in construction, positive in operation and efficient in carrying out the purposes for which it is designed.

Other objects and advantages will become apparent as this disclosure proceeds.

In the accompanying drawings forming part of this specification, similar characters of reference indicate corresponding parts in all the views.

Fig. 1 is a rear view of a vibrating type electric bell, embodying the teachings of this invention. The gong is here shown, broken away in parts.

Fig. 2 is a section taken at line 2-2 in Fig. 1.

Fig. 3 is a magnified diagrammatic view, to aid in explaining the circuit breaker.

In the drawings, the numeral 15 designates a casing which holds the operating mechanism. The gong I6 is relatively large, has the casing i5 behind it, and both are maintained in assembly by means of a screw H. A C-shaped bracket l8, made of strip material, straddles the electro-magnet l9, housed in the casing. The numeral 20 denotes the core of said magnet, opposite which and spaced therefrom, is the armature 2|, in upright position. The armature at its lower end, is in any suitable manner, swingably mounted near the free end of the lower arm of the piece l8. The upper arm of said piece, acts to limit the movement of the armature 2| towards the magnet is, at edge 22. Through the upper region of the armature, there is an opening or hole 23, which clears the striker rod 24 lying therethrough. Said striker rod is mounted for horizontal slidable movement through said hole 23, and through loose slide-fit hole 25 in the wall of the casing l5. Between the exterior of the casing and the interior surface of the gong I6, said striker rod 24 terminates in a striker head 26, of some weight. In rest position, the striker head 26 is at a distance from the bell surface region it is to hit.

It is necessary, that when the armature 2| is attracted by the magnet core 20, such movement of the armature shall shift the striker rod 24, so that striker 26 shall move towards the gong 16. For such purpose, said striker rod 26 carries for instance a cotter pin 2'1, very near the armature, between the armature and the striker head 26. It is to be noted that the striker rod 24 is construcalways free for movement towards the region of the gong to be struck by the striker 26, and that upon reverse movement of said rod, the pin 21, will cause the armature 2| to return to initial rest position. Spring means is provided to return the striker rod 24 to initial rest position. This may be for instance, the compression coil spring 28, anchored at one end to said pin 21, and carried about the rod 2.4 to make. contact with the frame atthe region of the ho1e;-2- 5i To accomplish sudden recoil of the striker head 26 after it has struck the gong IS, the striker. rod 24 is provided about itself with a compression spring 28, acting between the; armature: 2|; and" the other remote end of the striker rod 24, where said spring 28 is stopped or anchoredby, means of the pin 29. For convenience, washers 30", 3|, 32 and 33, may be carried on: the. striker; rod, as; shown.

The bell construction. above described would" be of the single stroketype, operated by the H For continuous ringing, a circuit breaker is included-in the bell structure, and interposed in the circuit; A preferred embodiment of such will now-be described. The frame l5;- carriesa standard 31'; which has mounted on it the springy metal blad'e'members St and 392 lfhese bladesare spaced and insulated by insulative washers or tabs 48', 4| and 42. These blades and the standard extend in the same direction with and with faces parallel to thearmature 2|. Through a hole 43 in thestandardfil is loosely positioneda headeds-hank M 'of' insulative material; the liead l i thereof; being free for movement in its position" between the-blade 38 and the standard 3T: The parts are sodimensioned, that when the armature 2| is in normal rest position as in Fig.- l, the contact point 33' carried on--blade 38, and the contact point 39' carried" on blade- 39; are-in contact with each'other. When the" armature- 2| is attracted by the magnet; the

mace- 3 8 will assume-unstressed position at 38",

whereupon the contact points 38' and 39 will separate: When the blade-38 so moves; it will shift the insulated member M through hole 43, a bit towards or maintain its contact with the armature.- Upon' return-of the armature tonor malrest position as'in-Fig. 1, is will cause member-44 to shift and stress the blade 33, whereby contact of the points 38 and 39' will be resumed. Interposition' of'the circuit breaker in the circuit is empirical as shown in Fig. 3,,where'the bell terminals become those shown as 34 and 36-. Gperatiorr of the electrical circuits mentioned, is well known; and needs no further explanation;

' @fimportance to be noted in the operation of the mechanical structure, is'that when the armature 2| is attracted to the core w-upo'nactuation of the magnet 20. the armature will cause the striker rod 2'4" to receive a bl'ow at pin or stop' means 21', with a force which actuallythrows the said rod, sothat its striker Z'Bis impelled towards the gong region Hi". The momentum ofthe'mass 26; causes it to movea'hea'd'of arma ture movement, thus stressing spring 28"whibh' has a thrust actionto cause recoilofthe striker 28 to be stressed, but it is only the increment of rod movement caused by the momentum of the mass 26, which will cause the spring 28 to be stressed. Both said springs insure return of all of the mechanism to normal rest position as illustrated in Fig. 1, upon cessation of current in the magnet l9. To insure thrust action, the armature 2| is stopped at 22 to impart a sharp blow from". the armature: 21;. for giving the propellihg force to move the striker rod' 2 5".

, The terminals of the bell may be mounted on an insulative block 40, carried on the frame I5.

1; Holeszc'la are providedi'for mounting the bell onto a surface. No current flows through any part of the frame. The mass 26 is made just heavy enough so that its momentum will act against springfl 3. and;yet:give the striker rod 24, adequate movement independent of the action of the armature 21', so that the action shall be that the striker 26 is thrown against the gong l3, rather than carried-to thegong dependent entirelyupon extent of" armature-movement as-if connected to thearmature;

lf'ihis' invention is capable of numerous forms and variou's'applications without' departing from the essential features herein disclosed. Itis therefore intended and desired that the embodiment. herein shall be deemed illustrative and not restrictiveand that the patent shall cover all pat entahle n'oveltyhere'in set forth; reference being: held to. the followingfclaims'rather' than to" the" specific description herein, to indicate the: scope? off this invention;

11. In an electric bel'l'havinga frame carryinga gong, an electro-magnet and a movably mounted. armature adaptedto be moved by the. magnet in a predetermined 'direction upon actuation of said? magnet. in combinationwitha striker rod, lone git'udinally slidably mountedon the frame'alongr the line of said direction; one end of saidstriker' rodbeingad'apted to strikea certain region of the gong, means on and intermediate the ends of the striker rod, positioned to be intercepted by. the: armature. when the latter. moves in said certain direction, whereby" the striker rod is'moved to wards .the mentioned gong region; the strikerrod' being free for'movemen't in said mentioned direction independent of movement imparted. to' it by thetarmature, aspring to urgethe'striker rod;t'oia' predetermined rest position and comparatively: weakerspring*actingto urge the strikerrod in a; direction opposite to. said mentioned certain'd'imotion and also acting" to' urge apart, the armature' andthe': other end of the striker. rod; the strikerrodbeing of'sufiicientmass, whereby when; moved" by the armature; the momentum of"the' striker rod 'will give it movement independent of" the armature whereupon the weaker spring willbe stressed; the actionof armaturemovement upon actuationof the magnet, being to impart a. blow or'push' on'the said means which is inter-- cepted; v 2; An" electric bell'as'defi'ned in claim 1'; where in both springs are" compression coilsprings posi tioned'about'th'e striker rod at opposite sides of? thearmature.

3'; an e'lectricbelf having a framecarrying agong, ,an' elcctro magnet and a" movablymount ed" armature adaptedto be moved 'by the -magnet in a predetermined direction upon actuatioirof said magnet, a striker member adapted tobe. moved -by the armature a-r'egion of the gon'g'upom actuation oftl'ie-magnetand spring-means tourge rod-2B? Armature-movement will cause spring 75 the'armature'andistriker'member to a predter the armature; the length of said element being such that when the armature is in normal rest position, the said first springy strip will be flexed and in contact with the other spring strip, and when the armature has moved a predetermined distance upon actuation of the magnet, said springy strips will be out of contact; said element being of insulative nature at least between the armature and the first strip; one terminal 01' the magnet being in electrical connection with one of the strips; the other strip and the other terminal of the magnet, constituting the terminals of the bell.

MAURICE COLEMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 824,397 Word June 26, 1906 1,054,379 Wurster ..e Feb. 25, 1913 1,764,277 Moran June 1'7, 1933 2,360,666

Fish Oct. 17, 1944 

